L89 enabling/configuring SBAS

I am working on a L89 module and so far I have been able to receive NMEA sentences successfully. However, I want to set the SBAS service to only GAGAN. I am having a hard time figuring how to do it.

For more context, I am including the schematics below. I am using the UART to receive NMEA sentences.
Screenshot from 2022-10-01 10-30-56

Do I have to configure the port to send commands? Which commands do I have to use PAIR or PSTM type?

Hi Naman_Durve,

Set SBAS service to only GAGAN: $PSTMSBASSERVICE,3